These are 4 nyloc locking nuts with 5/16 unf thread to be used when fitting a Weber DCOE carburettor to an inlet manifold. DCOE, DCO/SP, DGAS, DGMS, DGV, DGAV, DMTL, DMTR, IDF, IDA, DCD, ICH, DCNF, DRT, DFM, DFV, TLDM, DFT, DIR, DFEV, TL, DRTC, DFTH, IDAP, ICEV & many more.
